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loop unrolling

Copying a loop's body several times per pass so the loop runs fewer passes and spends less time on the counter and branch.

Loop unrolling replicates the body k times per iteration, dividing the number of loop-control instructions by k, with a remainder loop for trip counts not divisible by k.

Examples

  • A loop of 100 additions can become 25 passes of 4 additions each.

See also

remainder loop loop-invariant code motion
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